TIG Rods UTP A 6222 Mo 2.4831 (Thermanit 625)

High-nickel TIG welding rod for welding high-strength and highly corrosion-resistant nickel-base alloys as well as for dissimilar joints and surfacing. The weld metal offers high strength, toughness, and corrosion resistance, as well as excellent resistance to hot cracking and stress cracking.

Standard designation

Material number

2.4831

AWS A5.14

ER NiCrMo-3

EN ISO 18274

S Ni 6625 (NiCr22Mo9Nb)

Main

areas of application

The TIG welding rod UTP A 6222 Mo is suitable for welding similar high-strength and highly corrosion-resistant nickel-base alloys, including:

X1 NiCrMoCuN25-20-6, material no. 1.4529, UNS N08926
X1 NiCrMoCuN25-20-5, material no. 1.4539, UNS N08904
NiCr21Mo, material no. 2.4858, UNS N08825
NiCr22Mo9Nb, material no. 2.4856, UNS N06625

Further areas of application include joint welding between ferritic and austenitic steels as well as surfacing on steel.

Due to its high yield strength, the welding rod is also suitable for welding 9% nickel steels. Typical fields of application are in the aerospace industry, the chemical industry, and in seawater environments.

Special

properties

The weld metal is characterized by favorable long-term creep values, high corrosion resistance, and excellent resistance to stress cracking and hot cracking.

It possesses high strength and toughness, even at temperatures up to 1100 °C. The alloying elements molybdenum and niobium in the nickel-chromium matrix ensure extraordinary fatigue strength.

The weld metal is highly oxidation-resistant, virtually immune to stress corrosion cracking, and resistant to intergranular corrosion without additional heat treatment.

Typical analysis of the

welding rod

C

Si

Cr

Mo

Ni

Fe

Typical values in weight percent

< 0.02

< 0.2

22.0

9.0

Balance

3.5

≤ 0.5

Mechanical properties

of the weld metal

(typical values)

Property

Unit

Value

0.2% yield strength R_p0,2

MPa

> 460

Tensile strength R_m

MPa

> 740

Elongation A

%

> 30

Impact energy K_V at room temperature

J

> 100

Impact energy K_V at −196 °C

J

> 85

Welding instructions

Weld seam preparation is carried out according to the respective plate thickness, for example, mechanically.

The welding zone must be clean and free of residues such as grease, paint, and metal dust. During welding, ensure the lowest possible heat input.

The interpass temperature should not exceed 150 °C. The recommended heat input is below 12 kJ/cm.

Approvals

TÜV, approval no. 20103, DNV, ABS, and LR

Available dimensions

Current type and polarity

Shielding gas according to EN ISO 14175

1.6 × 1000 mm

Direct current, negative pole (= −)

I 1 or R 1

2.0 × 1000 mm

Direct current, negative pole (= −)

I 1 or R 1

2.4 × 1000 mm

Direct current, negative pole (= −)

I 1 or R 1

3.2 × 1000 mm*

Direct current, negative pole (= −)

I 1 or R 1

* Available upon request.

Applicable TIG shielding gases

I 1 and R 1 according to EN ISO 14175